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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2ff74a57d109c200d1102967ede0380f0b3f48b9bb47bb7dc94d4915b6aaa245' 
  AND token = 'pmhU9SvpS/Aen3kk8gbQ17P9rH9RE0SbY1D+OK2hxRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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