Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1670ad9f9bf20c6f385f1fa1efeec36a7aa6abe1737b98bef6a5cf1a1707574c' 
  AND token = '4sbg1vSiLMH+Axyou4PaTacCb5J4CbQESlRj1Or+TJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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