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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '746446f9c316b76b956f5b9585a489de04c8f1efd58e2926ee6034364e79f315' 
  AND token = 'Xz6J7Ljx4xVb9HA3rqy7yX2e+pWLqjEepAzEy3fZd9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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