Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391accdb617878631c040ad43cacb2be5e746f0aacf97f5d9d44e3a316cea733' 
  AND token = 'QZINtAlMcsWYC7WWyZeKRpi5CMXV2x8QMbSUbYJPdqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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