Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea9084977ead1d437d1c8b78532f565597ece3341f247fcd7ea31d6f002d74d' 
  AND token = 'Bd8MS2m9Ehi+z3M4th7JPCB7XWxuM4Pg7AnuM1su/6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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