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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9f79bfe8b92b25090f03a415339d13558aaf44515a614140dc8b3c3946410d2' 
  AND token = 'vVFMntytqGCo/+7pilreEkZafT+u0MTSoUZmdG9VRzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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