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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0204f5cec3b801e99ab6ce0a0c992b39f1505c85043265539cd29c5e368fe49b' 
  AND token = 'e4O8A4teZNarl5SsHkcyOoHU3R9Y1JXdM8hnf0QnxIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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