Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc6dec9dae99d662f389d82f739c940069d46b2781637a6b54e2c85b84eb803' 
  AND token = 'mheIaIuAWq8zwWaXxob1U1cBFlkn1znrHbajxPrVyQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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