SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '28bf2d1572c1314320e584c8e6d65b13ae310806b93fc41a3e70e3c74a4a2358' 
  AND token = '1SN4c6cSaOBK/NgS1QpKc12tNcjE9Ws4NLP1lwbssvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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