Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4ea47f79e72c3dac1e1121dcfc5dac50eeae39a7d3ca12558d64bc13688c2b' 
  AND token = 'ue0DlZKIlvTJvmjuJdUa6owtCe9zsuC4vZWGakpbcew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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