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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '43bd8d642ffb4ae17a2075da066ddff084e4272456b3bccbe5e5e040c6abfbba' 
  AND token = 'HwyK2GyFYWRjPbcv8mbsbO0MnkwUSCb6lmgbFtpK8B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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