SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '240926870f6b5de4cd698e369d6d53373ced29831ddcb26dc11374dd45cb7b4d' 
  AND token = 'pvl8t5fBrgSodz0gKGZx5sfH9wb/p0yuABqPV9DM5/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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