Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6da52c9f371543ca2bfacae99361a59f521d11adebb8893f35638e9dac9b81c' 
  AND token = '+5A7/a+VPsPbP4Ru0hXXV5wshVrstOhjv2JCms3B3C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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