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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fbe38cecb7ebf0d9253880f62f55dde3f81dd5fc3de2a30f7b559955fd3c7d0a' 
  AND token = '4dzOeKSSq9Z/xSz1mEz5GYjuQWUFW2zmLDBIy8WJ2hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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