Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a48c3087bf90b554758afac25fb7efc7e8e53e79c03839a8a36adda9f19c4a' 
  AND token = 'UAtU3cyw6JeiRINl3EDDJ+MXIDnKD/6hJqQZrwclCQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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