Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0eb3c62fe374f7ad2bd6cd9155172bf2c0aeaa148f163a31dbf85ccaaa7736e' 
  AND token = 'izB4+5QlIn6iGLmKxVL7ei567qO+q1keiNdo0L3BKRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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