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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c01c7326a9ad2e949708f74538bf8c94cf944f069e2667444353ab3d40386809' 
  AND token = '2XdxpGVn/DYapmb7atsGoEymzStaN1g8S+8gTVI7mac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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