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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3ac368c4325ea21400e1deaa61d47b1adac8bfadf95d8f9fe369d87f0416e491' 
  AND token = '83JS+MUKLE526O9+17oR4zg04SInmx0wyU6vwzGrI78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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