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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c6bb2996038e5178a6c482e52b574ef1d99752f3eb158fc136ecb750380534f2' 
  AND token = 'ArwByAYMG+cj+xrgbMTqMMlkW5r13NAwzMfsEzTNAow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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