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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4cc3daddc5b71e32539f830e1b92db3de6f8019c35f4ba2cd7ae4d6ff614c378' 
  AND token = 'MaablJTm9YHzH5CLCS1oJtG/9W6x6WPp2HI0G3dDeDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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