Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785f9dd5bba0a3c6eade676ffa816a3979d5fdc8f4204dcc1d2ca8dee0f74aed' 
  AND token = 'j+vMNh5DffR4/pUq3ajKok4qTEL9OFhsDQTvUBbUBPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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