Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c44a05d030c6692adea886e886f9d1fce963d3cd27be1c93b129891bc0d5e68' 
  AND token = 'sc6/FFmFl0EXNiHaGVTM5VhphjM+jk+wUQYFFEarYHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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