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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fc932acad9bf1b6e2896196a97b7e51c9e8334fb6d6ba582b23706bcece14e0c' 
  AND token = 'ta9fDW/+G81STM5y1KP1LrNrU5lJHZHYYLFyuxrGXeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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