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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a1e9d77edb3623e196a99f77b1f7134e7b02f129c66972561bc2b361bb6a7b06' 
  AND token = 'WKeNp5Lm32rpnOythRppmvVMBz9Wvu2OTB4wKm/wJMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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