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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2c26b487b52e1d66eaa317ae9128827e606c8ee37eefff823e2a40a3139130a' 
  AND token = '64wBqouDp3UlU4F7TNXOa6l22Kbry3EaRJz9pJRAZVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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