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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4d001d34601b5652082194b8b7b8b3fabe558a035ec640809a441b16de8b81ff' 
  AND token = 'x1MmYY/qpouP9FN47bVoZN+qOAwAwsWsT0bVoXhY+1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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