Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e006b7a2a83a1c71b9c0050b5f14f865a2a793e5b2685fd91267df4e2ffdb1' 
  AND token = 'qZlZR4Q3zSTfClb2s8+HFRZct9CVGCf6IPYUlyQDQ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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