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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d76e52d272ceba0a539352a91225d2bdf159fc5bdecd1e80532265430654b0a' 
  AND token = '0Fh2sdT9rbptJpciK7NgsD44w3iLaN5gxMIdZEG+ssA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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