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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '966a5d516a1a7a3eb0c9f203cc5e025689ed7f8de985c600f26a68122391bd8e' 
  AND token = 'JhW/iSgO5HaJ7EmJ6Syphg6ve4cCFPeamNidbO1KGUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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