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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '80592979081c4546d05ea167b654d716c16c76d95e366735ef8c50573fef33f9' 
  AND token = '1mWrY6ljczbjZOmT/gZSBSjg8/06ZkV5dXZgtbQg9+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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