SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'bfc671e294644578ac4b19d9014b833fc8b9288355211a790a526abd9c083a45' 
  AND token = 'Yf1DfjfNjuYWCo8mCNoKVdfjpnVXGpI4TddIVH2uwgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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