Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382a84edd35014e8dded6a329e3f2e3febf73057eb618063ff07dac757f827d1' 
  AND token = '4OnOQKSyzHlajJ3XpDcu1ookMyvNBWa+TsQRVAfsLu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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