Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50da0dd0cfbca9f1807aaa9dbeea8c84c776323c9ccdfb39e9fc217e4c018ae2' 
  AND token = 'jjTQICWnaLEAbJVduhiwl1LJZkTBk1IAs6XUFEHr6ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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