SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '823a54b96359dc1efc0a447ba2bf4bade303778ed1c7477ef4204b07c11875e2' 
  AND token = 'YrhjqcHA8uMoNaAmxOWj1iYRGwM9bUX0vM/P5mYI6+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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