Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd67b7c2fa8d7641dd43c5cad68e53fe77387e7084741f4247670b515fbca82cf' 
  AND token = 'JnJUglkSQhHEH7AuJtS9+RVK5QWLQG4cXecaAXlcqN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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