SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9e5f46c97a5a3f895cd210fc825773b8c9265e8312f48a522bab38aba606ac14' 
  AND token = 'FrV+BYxJJ4HOkQc5Gsvpvb7lJD0TVD1k+WJI/7isCXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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