Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f8a9bdca0f9fa7dc64e29bcbda1d71c9817a029e3d7ff3eb3e1dbf15794366' 
  AND token = 'PAFsLwcZ8oqVifj0F3x2kp5p6W0bk4LX7qAYk+kAkXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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