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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e337ed980cae822882ee043bd10583c26d6e3f9da338d1fd7f7848f1362a8c36' 
  AND token = '/F45PSe4pSoB+Evk3BzzhHYkVeX1EBHnraPKuaAu3ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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