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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '054811ce2baaee629681cd25daf32cd29bc12aab0d6038799216b00d6f2c6f90' 
  AND token = '8DQTRGvvgDkgBgb0SiQ/HRny/y134ozyTfdxi6Lqdqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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