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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f9895c57e810f47e9fa8bcf01316b2981a2bab6b9c25df9d7aec9dff277a69' 
  AND token = '3qpP0edDcCboQjS17aKOqm7AyOTzCFfrP4bi2S0xzjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}