Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6ceaea8891dfa68a8515a4a52e8e155957a3515af45c4476756ad01624e877' 
  AND token = '342MXrQr7lwnvzeP+nND2YL8xYZRNXY9kq4b+HYJH0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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