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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dc62fe704d7e43da1f0517cd042ec6c01a3db7221a837a16a435683c6b1eba46' 
  AND token = '1oiDMROATd7pZxfL/lKRHKx1AiSbqIje5c5s6TXwj6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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