Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc4ddcf0f6dc3a213eb82dd8636cbfdd6cacb65bd2b793595c64da44f0d063b' 
  AND token = 'c6zpLgkEl7rlJboJtsTMMjeaBqHhlGaaxgRMRzt1ReY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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