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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd6043af50b734cfb638923b6f3308d8894fe8823514e9c61ee1c91e4a2a697d6' 
  AND token = 'lKbgsNNneb1LV1ZTfE26wsn9qxeuxfkKeHCphyYOtes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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