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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9308c327de393d4f4d612259de26ff57648a804dd7523f54ce46c88028967d80' 
  AND token = 'WXy6WVTSipan+R9LpXSDImaJaj4h452fjzqnN+vb1pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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