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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4f183a0a99b8c60533ee6cff85069867c2130fcaf0645f1956f4d7803c8da7c2' 
  AND token = 'azo6adDGIsczv75wSCWsOZTbHGXfQpwqMMfziabTmzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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