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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'eec2ab9f83e21feedd46ef1e2a0b342a07bc7d1d6f0ffad6f70be609e196b3c9' 
  AND token = '9QS5j/bfaGKeETVeD3JRc4NhIqKMxaaOjfBVL31gJSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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