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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a38874ebfc86817c6e1ba1f5750b8cf38b9167a83435ec065a8df94682231627' 
  AND token = 'jWpqg3HWqH2Mp3ZDPyJ4Mn79i90Dqqght8dTFOwiqnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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