Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c987aad1398a2372a740a918c8fd98fd0f4ccc18d1c1512da6d84001e5c6e8' 
  AND token = 'b3GtdqufYUCkETwMe0agutocBlbp4/6NySKtH+6tWLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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