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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7c1406f7cf1282e63a3e0095bb6b743bf9c4bbcb5ce6be93f55b6ffa42eaaec5' 
  AND token = 'ZN29qqq3xTm4c2JJ+8zu/3SGr384TUkOMSI9Hq86gbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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