Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553a9490c7a0e02fa7ffcd961140b53d3df4c8c28a8368ec1cbd7d486b61d9fd' 
  AND token = 'u0ZZodsxXbOtKIacJTmrbJz8dA+oNteEHVtfb9dniY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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