Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e1879d809f0ada59a8bf6282053d83849616b84c8b99049c61e2bb2975aed4' 
  AND token = '1KznUvXh2wc7nGbu5afxH0XdclnWYrFN60e5m+G081o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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