Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a753d152b518c0b0b28b68059d0056d6a9ce76b70f072663197f64f7f27b7e' 
  AND token = 'Uyy1phRJYx32/Yd9Sjxa9t7IiLcGGe2YGuqKxp344Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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