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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e97133f57a5b67a165151f6faa9b86463a92c576286f7df31e2db9bb4b850a66' 
  AND token = 'SV0pGm8FCMb2Exf+h1jn7SXYsvhSMLXx718sabtSoUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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