Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc6de53bde1ca8c22f650155b53708df8c64ffaacade46809e976b6fe5528db' 
  AND token = 'opE3ectybAuqfOinvYUU1tE+7x4DfntDR/T0Uk+ZC7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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