Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e0a861eaadb12ce1df35b583e41516a3a66af6e3d9455bdcec7055367e1a52' 
  AND token = 'RRl+WooqgD1//etbUPSZ9k9ghdeTXAde2f2u1alkTXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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