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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ca674ca818e8de226586ad84d7b14de24ae46ad7c10edf9f7e5052be5f637417' 
  AND token = '13u42bN1HffAqvqlqw8Nsh+LK3Xns794I1ZcSWhbQTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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