Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e257ed349820311263c1d30e2bad9d7ac70b0b4d6fca797cf2ab8c4aa7f2dc' 
  AND token = '3esfd+Vw7UM/cDRJz5veQW2Pz1gCIlga8U/Wc8ulMHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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