Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9a631c3c5adc8a993523f216ee16b356917877cafa5b66568c8a3b92487d38' 
  AND token = 'srD9GnoWLZls9Bnz2x+asnsFVPulF5o77cOtgxPb1RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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