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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '704731690e4737170c99cd9232c791f6baa35beaae0f829de404f6c044246771' 
  AND token = 'stqINlhkbOR0F7ECt5Ue+6hj1HiK8KrLEW6f72DuQSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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