Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5704be56645dcd684c51e0bb682fec432077d4298be5b0442255eaba61089217' 
  AND token = 'yec0mxsMttPpXR6kR9V+g1mgNhIW+G0NpAOJfNlNnoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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