Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb746ce04bf7dda7b4344adf41e3a9345f65f2710fcaa818c40d7eec3c0a084' 
  AND token = 'vDrSAJUl6Hd42cTV7Ub6EgOHRvnPyCNVcb3txUEcAsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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