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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a17e1d347c267a2a593add1b4e6dca4c9e6086a5086a222f2cc799ad44e97616' 
  AND token = 'xNCK/rl1IbhACFqps/nEWh5xlm2v4AY0EmmEBd1XnWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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