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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '202736578109f8f09c0d9371eb2d87ab0c3655b335634bca907026c302360208' 
  AND token = '8JeI/+kJbhMXyXfdQdLOMgdwVEa+JEG8oWFpxKH2IyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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