Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a357f5f39e841692dd0362317515b92dcdc45dba967f7fada5497d66b616446' 
  AND token = 'ulvuu1E4iD6vlj5Zmtg/782c874IXdO3lUxlewpmlSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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