Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93ecd69fec7eea3be34b2345e8eb66aeef25a026151f674fa324bc76add5dcad' 
  AND token = 'dqbSEb+sH2FtWmR6EgFm8xAJ5IfcAzLgTi+o7UbO2ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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