Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb90cb853e9c45e1b0f2137b5749fb95d3a56dc1118c58b3cf8c6effb67a4e8' 
  AND token = 'SC3MLabn4TDlc2aNqt/m0qeUFjqMBjuP7dxW5x16hAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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