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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2d9e9f61636756ea198fadd82f2e4ea158c73bf8324b5111d7b8cf2d1b618787' 
  AND token = '7/xdNDWNNm1aX4GhutH35dSpPGuuaECs+ZjqJy3DlAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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