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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'dcc5fd4d3bbb24165206fd792e84a8b48c56d9dda8c518374a608f85900b1b73' 
  AND token = 'ZJ6su25EM2w+hZ6k0ctjoldkWepuVI8eUuMtVcE1W80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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