Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1fc54b25f3ac81d44ccdfd37d15447124c972b6e1bd38833e022a368c50f747' 
  AND token = 'Ffw6wQdLwInmyMIr2sYPM7yUmgggutibCffKpfizR6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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