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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7b9d95eda596af69988433a9ac146428fd4bd1186bffcca2a02301e543bdb313' 
  AND token = '+ZZJhOVOD5gLNIXS4HfLkuXutMRxQ3Hlf1+j8W9wn+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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