Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b15e88ee94f6de70b355c1fee9ed5c05df69757f0163af4d4dd23f34ba4a54b' 
  AND token = '2Y0KavVmgh8kyPlR9Tb7ZEwZaC3fK56+V61C+GvYuic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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