Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88480dea95c87332b47189adde3a50d4191a105fd77b5dbef1a8c61182deffc' 
  AND token = 'mMGsAJphwkUKW5IEGOKn/sl2lsDH2aefdy1vPMTeHIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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