Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b6cea222aead261be697df2eb917ad99833f2df62284a3dd42dcbfe5a0c454' 
  AND token = 'GmdIQ0/scVnNV+dexHFKMxVNP/wjd9a9XYpUSKetqKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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