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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f7966602c43239b94069a50e79313efa1ec441bb466be4d5bb9a08fceebecf4b' 
  AND token = '6Vc35EGzTuW7AIt5eB9SvVJU9a4jZOuhoKBTj+lo60s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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