SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8990e2f0357a3535c1b62f5246415aab4ab2d2e9a10ff2d5bc58b1f9900b7918' 
  AND token = 'oqvGD0bUynGD5FUQhBYbqllbNEmwMDD6H8Wp2sLLqQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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