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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'abe1d6f1a5daf122083b2ac53dfa683613c6278601495092871877266bdaf8c8' 
  AND token = 'Yq1KXDfoZ96j88o0q4d9Sz8QwFSziEGwl4kMlUWXN9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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