SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c678f20027b8fd902d1f404362658fea0beb1fd1a20ce8345c06a497ebc2d92c' 
  AND token = 'k5MxZzCUfZP8VkAYHpJwPbwHVQ+B53pednqndrZSym0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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