Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d4a21a46b9310e117685ba829e82275a6bd6009a199a34eaa22095d7e3d506' 
  AND token = '8CuhK2xKkoCxndGuN88mbowPn7bfaKdqlaoxqfQ8v0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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