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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c97a89e6a8d289c25ea99b6b015986469a359e5e3692f55f87606913b0f69a1a' 
  AND token = 'ia73L1r6w9rUtIXgmbMfwLwdaO7LIqtM+P/WjDMrEIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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