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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e79e25d045e3f4d26ec7ba3d6737e95d9a0c39238649150ab478ce66047a5265' 
  AND token = 'HncHdv65sVRx7fXGuQO2pkdn1ROKaFSskkugwJ/xCQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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