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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ace78aaac2b21f6ddc63f80accbb5f0e4878beecf809b3e029483349a2c22b48' 
  AND token = '1gR/qr/JvXTenusPUr+mll0pvwdNOUzv1XXQSBxReM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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