Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e875cc4995a59c3ae618522101a4c94fbf382585df2404e652c334f9b9d7d421' 
  AND token = 'j0uFUa5gqAjDjkptYgvsfn1wePgxuc5BNvgoTEu7y+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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