Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f50a09e1bd25f39d3a8ed73f3a6bd37d489e6ef1016e9e8122a4db3c0a73a0' 
  AND token = '/e46lbNmyQZ1neXMtUbFDhcRfz6rm8ySlbUq4Ri7pIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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