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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c32c45b56c731757a9903452c5fbefbe40ced665f39b1cc3e54cd9a9706c458' 
  AND token = 'wpdFpYPZMdqRKCyO41HqDsIytayj/lGticao52nP+k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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