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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd85199f78dd412595524c23b40d91f357c8957e5487d2047e6aacf2a1851932b' 
  AND token = 'FdSbQA0lsnqtP32FwxjjmX2WOJ3H1UfIscgplCFPbT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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