Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858f8975a33e1944a21be3811a340c243efcbe0969743e7b4a7b797090b32522' 
  AND token = '8IpBcJvX4rmrAkV4rgLYeK47UrPcDLqhy3hV4DycziI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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