Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c5c822d29d5f0698c4518d91133f91a4eade599221bcebff1bbdd9594981a8' 
  AND token = '/FvDgD4h6CVyLdwp9dGWZSqkf0gvq7D2z0vDDy5hTB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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