Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd63b6a2028355293e2c35ff5efadb2ad3ec48ccb887bc3b285ab4ed1d8bc162a' 
  AND token = 'B1v0o06XCLJ7bEuh+VhVu8Urct6iflncN1a+XT38ChM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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